Led4power.com : LD-4 CC linear drivers, ILC-0/1 illuminated tailcaps, optics, MOSX, copper DTP MCPCBs...

Ok, thanks again!
Will see when I get home.

Btw when I say continuity I mean diode test. Sorry :slight_smile:

Added the other pcb/LED to my scheme :slight_smile:

Google Photos

This other LED did come on sinkpad pcb. It’s only the XHP70 og mosX i did myself.

Measured resistanse between + and M. Even at 20M it is out of range.

Tried new driver. Soldered gate very carefully :slight_smile: went ok.

Same result though when I have my meter on diode test and measure between + and - on mosx the LED lights up as if the FET is on.

Adding some pictures. Is it possible the LED itself sit wrong on the pcb allthough I cant measure any shorts?

The driver
Google Photos
Google Photos

MosX
Google Photos

From led4power website to see how the pads look
Google Photos

XHP 70 datasheet shows what is anode and cathode
Google Photos

I followed this video on how to flow the LED onto the mosx. Only difference was that I did it in the kitchen using an old frying pan (don’t use it for cooking anymore :wink: ).

Used low temperature solder paste. I don’t think the solder on the fet melted while I did it.

So your FET is in series with two leds? Does it get the right voltage to function?

Yes it is. Input voltage on the driver is 16V. Two series LEDs in series.

Maybe I should switch them around so the mosx is closest to ground?

But this was my next question: do I need to hook up the battery for the FET to function? I thought it was normally open curcuit. A bit scared to power on after yesterday when I think it was direct drive…

mosX board should be last in chain from battery + to gnd (or closest to gnd), so if you connect it like in diagram it's not good.

Cool. I’ll try :smiley:

FET is normally open (high resistance) but if gate pin is free floating it can be charged for example via testing with mulitmeter and FET will be in closed (low Ohm) state for quite a few seconds even without any voltage applied to gate becasue of gate capacitance.

Actually this is the way I test mosX boards with FET: I charge gate by applying x.xV for 1-2sec, and then I connect mosX board with LED to power supply to + and - pads like standard (non mosX ) MCPCBs.

Worked like a charm! Excellent, thank you. :slight_smile: :slight_smile:

Some test fitting while I wait on LEDs

New LD-B4 12A 20MM. The pads are huge on this and easy to solder. Looking forward to finishing this build…

Finished product:

LEDs: 6x LH351D 3500K 90CRI

12A CC mode
~11.55A tail - 3,205lm

FET mode (VTC5D)
~19.4A tail - 4,370lm

Was there never a MOSLED Extreme 4*XP*? Only the black board one was made?

Yes, no 4xp mosX in 20mm size.

The black mosled should be ok with M2 quad at 12A right? Sitting on big chunk of copper

Which LEDs?

351D or SST-20 probably

At 3Amps per LED they are within rated manufacturer current which means they would be ok even on ultra cheap standard dielectric MCPCBs, so black mosled 4x is more than fine.

My new helmet light.

Ldb4 hv 6A driving 1 xhp70.2 and 1 xhp50.2 in series off a 4S battery. CNC milled housing in aluminium for good thermal properties. 3d printed gopro mount. And remote control of course. Looking forward to try it on the trails :D

Next step is anodizing and paint.

https://photos.app.goo.gl/iitiGKdBAruXCwbD8

https://photos.app.goo.gl/sNYXwPNi9yMg6Vkm8

https://photos.app.goo.gl/MjQkugScJjMPFXzb8

https://photos.app.goo.gl/km6Etn64wY469faA9

https://photos.app.goo.gl/bPFP5v5H3x48W7if8

https://photos.app.goo.gl/YtoXnkFL3t3JSvMf9

Damn that is fancy. Nice work

Thanks :wink:

Neven, is your website down for maintenance? I’m struggling to get it loaded.